Method for manufacturing water-penetration-preventing double-layer fabric and double-layer fabric

ABSTRACT

A method for manufacturing a water-penetration-preventing double-layer fabric and a double-layer fabric. The double-layer fabric includes two surface layer textures and a cross-linked texture. The two surface layer textures can be respectively formed by a base yarn and a fusible yarn, or each of the two surface layer textures includes the base and fusible yarns. A melting point of the base yarn is higher than that of the fusible yarn, one of the surface layer textures is heated and pressed to melt the fusible yarn to form a barrier layer, the cross-linked texture cross-links the surface layer textures, a space between the surface layer textures is formed with the cross-linked texture provided with a yarn-stacked thickness by a tuck knitting or a transfer knitting, and an increased temperature of the surface layer texture without heating and pressing is not higher than a melting point of the fusible yarn.

FIELD OF THE INVENTION

The present invention relates to a method for manufacturing awater-penetration-preventing double-layer fabric and a double-layerfabric, and more particularly to a method for heating and melting one ofsurface layer textures to form a barrier layer for manufacturing adouble-layer fabric capable of preventing water penetration and adouble-layer fabric.

BACKGROUND OF THE INVENTION

According to investigation, there are at least two types of conventionalwaterproof fabrics, one type is products made of GORE-TEX film. Thistype of product is coated with GORE-TEX film on a surface of the fabricto achieve water blocking effect. However, GORE-TEX film tends to loseits waterproof effect after a long time usage, and the materials used inGORE-TEX film are special, which make the costs of waterproof fabricsmade of GORE-TEX film expensive.

In this regard, the industry has developed waterproof glue or waterprooffilm made of plastic materials. Although the cost of this type ofwaterproof glue or waterproof film is lower than that of GORE-TEX filmand can be commonly found in the market, however, after this type offabric is coated with waterproof glue or waterproof film, the fabricwill harden as the waterproof glue or waterproof film cures, causing theconsumers to be unable to have a good, comfortable and soft feeling withthis type of waterproof fabric worn on the body.

SUMMARY OF THE INVENTION

A main object of the present invention is to solve the problems of agingor limited effectiveness over a period of time, and high cost of theconventional GORE-TEX film.

Another object of the present invention is to solve the problem that thewaterproof mechanism adopted by a waterproof fabric being incapable ofproviding a feeling of softness and comfort.

In order to achieve the above objects, the present invention provides amethod for manufacturing a water-penetration-preventing double-layerfabric, comprising steps of:

step one: knitting two surface layer textures with current yarns,wherein the current yarns are selected from a group consisting of a baseyarn, a fusible yarn, and a combination thereof, a melting point of thebase yarn is higher than a melting point of the fusible yarn, and thetwo surface layer textures are selected from a first implementation typeand a second implementation type, wherein:

in the first implementation type, each of the two surface layer texturescomprises the base yarn and the fusible yarn; and

in the second implementation type, one of the two surface layer texturesis formed with the base yarn, and the other one of the two surface layertextures is formed with the fusible yarn;

step two: forming a cross-linked texture by continuously cross-linkingthe two surface layer textures through a tuck knitting or a transferknitting, and generating a yarn-stacked thickness during knitting at areserved space between the two surface layer textures to extend a heatconduction path of the cross-linked texture;

step three: completing an intermediate product, wherein the intermediateproduct is a double-layer fabric; and

step four: heating and pressing one side of the intermediate product tomelt the fusible yarn in one of the two surface layer textures which isheated and pressed and to form a barrier layer which prevents waterpenetration, wherein during heating and pressing the cross-linkedtexture, an increased temperature of one of the two surface layertextures that has not been heated and pressed is not higher than themelting point of the fusible yarn due to the yarn-stacked thickness ofthe cross-linked texture.

In one embodiment, in step two, the cross-linked texture is formed withthe current yarns used for knitting the two surface layer textures orformed with an another yarn additionally fed.

In one embodiment, the another yarn additionally fed is selected from agroup consisting of a first yarn type, a second yarn type and a thirdyarn type, wherein:

in the first yarn type, the another yarn additionally fed is the baseyarn;

in the second yarn type, the another yarn additionally fed is thefusible yarn; and

in the third yarn type, the another yarn additionally fed is composed ofthe base yarn and the fusible yarn.

In one embodiment, a material of the fusible yarn is selected frompolypropylene (PP) or thermoplastic polyurethane (TPU).

In one embodiment, a temperature for heating and pressing one side ofthe intermediate product is between 110° C. and 190° C.

In one embodiment, when in step four, applying negative pressure to oneof the two surface layer textures that has not been heated and pressed.

In one embodiment, in step four, locally heating and pressing one of thetwo surface layer textures which is heated and pressed with highfrequency.

In addition to the foregoing, the present invention further provides awater-penetration-preventing double-layer fabric, comprising:

two surface layer textures, knitted with yarns selected from a groupconsisting of a base yarn, a fusible yarn or a combination thereof, thetwo surface layer textures are selected from a first implementation typeand a second implementation type, wherein

in the first implementation type, each of the two surface layer texturescomprising the base yarn and the fusible yarn; and

in the second implementation type, one of the two surface layer texturesbeing formed with the base yarn, and the other of the two surface layertextures being the fusible yarn;

wherein a melting point of the base yarn is higher than a melting pointof the fusible yarn, one of the two surface layer textures is heated andpressed and the fusible yarn thereof is melted to form a barrier layerwhich prevents water penetration; and

a cross-linked texture, cross-linking the two surface layer textures,the cross-linked texture is formed by a tuck knitting or a transferknitting and comprising a yarn-stacked thickness located at a spacebetween the two surface layer textures, wherein the yarn-stackedthickness at least meets a following condition that within a heating andpressing time, an increased temperature of one of the two surface layertextures that has not heated and pressed is not higher than the meltingpoint of the fusible yarn.

In one embodiment, the cross-linked texture is formed with the yarnsused for knitting the two surface layer textures or formed with ananother yarn additionally fed.

In one embodiment, the another yarn additionally fed is selected from agroup consisting a first yarn type, a second yarn type and a third yarntype, wherein

in the first yarn type, the another yarn additionally fed is the baseyarn;

in the second yarn type, the another yarn additionally fed is thefusible yarn; and

in the third yarn type, the another yarn additionally fed is composed ofthe base yarn and the fusible yarn.

In one embodiment, a material of the fusible yarn is selected frompolypropylene (PP) or thermoplastic polyurethane (TPU).

Through the aforementioned disclosure of the present invention, comparedwith the prior art, the present invention has the following features:one of the two surface layer textures is heated and pressed to make thefusible yarn to which the surface layer texture belongs to be melted toform the barrier layer capable of blocking water penetration, and athickness of the cross-linked texture causes an increased temperature ofone of the two surface layer textures that has not been heated andpressed not higher than a melting point of the fusible yarn during theheating and pressing process, thereby making the double-layer fabriccapable of maintaining a softness of the fabric while providing awaterproof effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a first flow chart of a first implementation type of thepresent invention;

FIG. 2 is a flow chart of a second implementation type of the presentinvention;

FIG. 3 is a second flow chart of the first implementation type of thepresent invention;

FIG. 4 is a first schematic diagram of a double-layer fabric of thefirst implementation type of the present invention;

FIG. 5 is a first schematic diagram of tuck knitting of the presentinvention;

FIG. 6 is a second schematic diagram of tuck knitting of the presentinvention;

FIG. 7 is a first schematic diagram of a double-layer fabric of thesecond implementation type of the present invention;

FIG. 8 is a second schematic diagram of the double-layer fabric of thesecond implementation type of the present invention; and

FIG. 9 is a second schematic diagram of the double-layer fabric of thefirst implementation type of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The detailed description and technical content of the present inventionare described below with reference to the drawings.

Please refer to FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7and FIG. 8. The present invention provides a method 10 for manufacturinga water-penetration-preventing double-layer fabric, the method 10comprising the following steps.

Step one 11: knitting two surface layer textures 21 with current yarns,wherein the current yarns are selected from a group consisting of a baseyarn 211, a fusible yarn 212 and a combination thereof, a melting pointof the base yarn 211 is higher than a melting point of the fusible yarn212, and the two surface layer textures 21 are selected from a firstimplementation type and a second implementation type. In the firstimplementation type, each of the two surface layer textures 21comprising the base yarn 211 and the fusible yarn 212. In the secondimplementation type, one of the two surface layer textures 21 beingformed with the base yarn 211, and the other of the two surface layertextures 21 being formed with the fusible yarn 212.

Step two 12: forming a cross-linked texture 24 by continuouslycross-linking the two surface layer textures 21 through a tuck knittingor a transfer knitting, and generating a yarn-stacked thickness 241during knitting at a reserved space between the two surface layertextures 21 to extend a heat conduction path of the cross-linked texture24.

Step three 13: completing an intermediate product, wherein theintermediate product is a double-layer fabric 20.

Step four 14: heating and pressing one side of the intermediate productto melt the fusible yarn 212 in one of the two surface layer textures 21which is heated and pressed and to form a barrier layer 25 whichprevents water penetration, wherein during heating and pressing thecross-linked texture 24, an increased temperature of one of the twosurface layer textures 21 that has not been heated and pressed is nothigher than the melting point of the fusible yarn 212 due to theyarn-stacked thickness 241.

Specifically, the knitting related steps in the method 10 of the presentinvention are all completed by knitting using a flat knitting machine,and are realized by a front bed (FB) and a back bed (BB) comprised bythe flat knitting machine. Specific structures of the front bed and theback bed are conventional techniques in the art, and will not bedescribed here. In addition, the present invention will describe the twosurface layer textures 21 in detail hereinafter, so the firstimplementation type and the second implementation type of the twosurface layer textures 21 will be described hereinafter.

The two surface layer textures 21 which are the first implementationtype are described. In step one 11, the two surface layer textures 21are knitted by the current yarn through the flat knitting machine. Thecurrent yarn includes a base yarn 211 and a fusible yarn 212. The baseyarn 211 can actually be an ordinary cotton yarn. A melting point of thefusible yarn 212 is lower than that of the base yarn 211, and thefusible yarn 212 can be made of a thermally fusible material, so thatthe fusible yarn 212 is melted by heat when being heated. In oneembodiment, a material of the fusible yarn 212 is selected frompolypropylene (PP) or thermoplastic polyurethane (TPU). Then, in steptwo 12, the flat knitting machine continuously cross-links the twosurface layer textures 21 by the tuck knitting or the transfer knittingto form the cross-linked texture 24. It is worth noting that thecross-linked texture 24 described herein actually only cross-links thetwo surface layer textures 21, and does not have a function ofsupporting the two surface layer textures 21, that is, the cross-linkedtexture 24 is different from the support yarn texture described by thosewith ordinary skill in the art. Furthermore, the cross-linked texture 24depicted in FIG. 4 herein is only for illustration, and the cross-linkedtexture 24 can actually be formed by stacking and interlacing multipleyarns, thereby enabling the two surface layer textures 21 to be tightlycross-linked. In addition, since the tuck knitting and the transferknitting of the flat knitting machine can be programmed differentlyaccording to an operator's programming of the front bed and the backbed, knitting steps of the tuck knitting and the transfer knitting aredifferent, so it will be described by making examples in the latter partof the specification, and will not be described in detail here. Further,in a process of cross-linking the two surface layer textures 21, theflat knitting machine makes a reserved space between the two surfacelayer textures 21 generate the yarn-stacked thickness 241 to enable thecross-linked texture 24 capable of extending a path of heat conduction.Afterwards, proceeding to step three 13, the flat knitting machinecompletes knitting and produces the intermediate product, theintermediate product is a semi-finished product of the presentinvention, that is, the double-layer fabric 20 that has not been heatedand pressed. Proceeding to step four 14, using a heating and pressingequipment capable of providing a heat source to heat and press one sideof the double-layer fabric 20, wherein the heating and pressingequipment can heat and press one side of the double-layer fabric 20 atthe same time, or heating and pressing are performed separately on thedouble-layer fabric 20, and a heating temperature can be set in a rangebetween 110° C. and 190° C. After one side of the double-layer fabric 20is heated and pressed, the fusible yarn 212 to which the surface layerstructure 21 belongs is melted by heat to form the barrier layer 25, andthe barrier layer 25 is capable of preventing water from penetratingfrom one of the surface layer textures 21 to the other of the surfacelayer textures 21. At the same time, the surface layer texture 21 afterbeing heated and pressed further transfers heat energy toward thecross-linked texture 24, so that a part of the cross-linked texture 24adjacent to one of the surface layer textures 21 being heated andpressed is also melted by heat. One of the two surface layer textures 21that is not heated and pressed, due to the yarn-stacked thickness 241providing a sufficient length of heat conduction path, has a raisedtemperature which is not higher than a melting point of the fusible yarn212, thus it is not melted by heat, and a softness of the fabric ismaintained.

Furthermore, please refer to FIG. 2, FIG. 7 and FIG. 8, the two surfacelayer textures 21 which are the second implementation type aredescribed. In the following, in order to facilitate readers todistinguish the second implementation type from the first implementationtype, the following implementation methods and steps are marked withdifferent component numbers. In step one 51, the flat knitting machineknits the two surface layer textures 21 with the base yarn 211 and thefusible yarn 212 respectively. That is, after knitting of the twosurface layer textures 21 is completed, one of the two surface layertextures 21 is the base yarn 211 (as indicated by reference number 214),and the other of the two surface layer textures 21 is the fusible yarn212 (as indicated by reference number 215). Wherein, the base yarn 211can actually be an ordinary cotton yarn, a melting point of the fusibleyarn 212 is lower than that of the base yarn 211, and the fusible yarn212 can be made of a thermally fusible material, so that the fusibleyarn 212 is melted by heat when being heated. In one embodiment, amaterial of the fusible yarn 212 is selected from polypropylene (PP) orthermoplastic polyurethane (TPU). Then in step two 52, the flat knittingmachine cross-links the two surface layer textures 21, and continuouslycross-links the two surface layer textures 21 by the tuck knitting andthe transfer knitting to form the cross-linked texture 24. Further, in aprocess of cross-linking the two surface layer textures 21, the flatknitting machine makes a reserved space between the two surface layertextures 21 generate the yarn-stacked thickness 241 to enable thecross-linked texture 24 capable of extending a path of heat conduction.

Then, proceeding to step three 53, the flat knitting machine completesknitting and producing the intermediate product, the intermediateproduct is a semi-finished product of the present invention, that is,the double-layer fabric 20 that has not been heated and pressed.Proceeding to step four 54, using the heating and pressing equipmentcapable of providing a heat source to heat and press the one formed bythe fusible yarn 212 of the two surface layer texture 21 (as indicatedby reference number 215), wherein the heating and pressing equipment canheat and press the one formed by the fusible yarn 212 of the two surfacelayer texture 21 (as indicated by reference number 215) at the sametime, or heat and press the one formed by the fusible yarn 212 of thetwo surface layer texture 21 (as indicated by reference number 215)separately. In one embodiment, a heating temperature applied by theheating and pressing equipment is in a range between 110° C. and 190° C.After the double-layer fabric 20 is heated and pressed, the one formedby the fusible yarn 212 of the two surface layer texture 21 (asindicated by reference number 215) is melted by heat to form the barrierlayer 25, and the barrier layer 25 is capable of preventing water frompenetrating from one of the surface layer textures 21 to the othersurface layer texture 21. At the same time, the one formed by thefusible yarn 212 of the two surface layer texture 21 (as indicated byreference number 215) further transfers heat energy toward thecross-linked texture 24, so that a part of the cross-linked texture 24adjacent to the one formed by the fusible yarn 212 of the two surfacelayer texture 21 (as indicated by reference number 215) is also meltedby heat, and the one formed by the base yarn 211 of the two surfacelayer texture 21 (as indicated by reference number 214), due to theyarn-stacked thickness 241 providing a sufficient length of heatconduction path, has a raised temperature which is not higher than amelting point of the fusible yarn 212, thus it is not melted by heat,and a softness of the fabric is maintained.

The present invention does not make the double-layer fabric 20 toachieve waterproof effect by using the conventional mechanism, but makesone of the two surface layer textures 21 of the double-layer fabric 20to be melted by heat to produce the barrier layer 25, and at the sametime, the cross-linked texture 24 is allowed to block the heat energy ofone of the two surface layer textures 21 being hot-pressed from beingtransferred to the other one of the two surface layer textures 21,thereby directly forming the barrier layer 25 on the double-layer fabric20 to achieve an object of preventing water penetration, and anotherside of the double-layer fabric 20 is not heated so as to maintain asoftness of the fabric.

In one embodiment, FIG. 5 and FIG. 6 are used as examples to illustratethe programming of the tuck knitting. Using FIG. 5 for description,after a yarn feeding mechanism of the flat knitting machine feeds theyarn on the front bed, the flat knitting machine performs tuck knittingon the front bed at positions apart from each other by one stitch, sothat a portion of the yarn located on the front bed can be tucked on theback bed. Using FIG. 6 for description, after the flat knitting machineknits the two surface layer textures 21, and the yarn feeding mechanismfeeds the yarn, the flat knitting machine makes the yarn on the frontbed tuck on the back bed at a position separated by several stitches,and then tuck the yarn located on the bed on the front bed at positionsseparated by several stitches. Wherein, in the present invention, thetuck knittings depicted in FIG. 5 and FIG. 6 are merely examples, andare not intended to limit the programming of the tuck knitting.

Furthermore, as shown in FIG. 3, FIG. 7, FIG. 8 and FIG. 9, in step two12, the cross-linked texture 24 is formed with the yarn used forknitting the two surface layer textures 21 or formed with an anotheryarn 240 additionally fed. Specifically, as shown in FIG. 4, when theflat knitting machine knits the two surface layer textures 21, thecross-linked texture 24 can be knitted with the base yarn 211 and thefusible yarn 212 contained in each of the two surface layer textures 21.Alternatively, as shown in FIG. 7 and FIG. 8, the cross-linked texture24 can be knitted with the base yarn 211 or the fusible yarn 212 whenthe flat knitting machine knits the two surface layer textures 21. Inaddition, as shown in FIG. 9, the cross-linked texture 24 can also beknitted by the flat knitting machine by means of additional yarnfeeding, and the another yarn 240 used by the flat knitting machine foradditional yarn feeding can be formed with the base yarn 211, or thefusible yarn 212, or a mixture of the base yarn 211 and the fusible yarn212.

On the other hand, as shown in FIG. 3 and FIG. 4, in one embodiment,step four 14 further includes a sub-step 141 of applying negativepressure on the one that is not heated or pressed of the two surfacelayer texture 21. Specifically, after the double-layer fabric 20 formsthe cross-linked texture 24, when the heating and pressing equipmentheats and presses one of the two surface layer textures 21, thehot-pressing equipment can provide negative pressure on the other one ofthe two surface layer textures 21 simultaneously to form a temperaturedifference between the two surface layer textures 21, thereby inhibitingthe transfer of heat energy through the cross-linked texture 24 to oneof the surface layer textures 21 that has not been heated and pressed,and avoiding the one that has not been heated and pressed of the twosurface layer textures 21 to be melted by heat, and at the same time,hot-melting of the cross-linked texture 24 can be reduced. In addition,in another embodiment, when the present invention heats and presses oneof the two surface layer textures 21 in step four 14, the heating andpressing equipment can provide high-frequency heat treatment withinduced current to locally heat and press one of the two surface layertextures 21 which is heated and pressed. Through the high-frequency heattreatment in this embodiment, only a partial structure of the twosurface layer textures 21 is heated and pressed, and a condition inwhich the two surface layer textures 21 being hot-pressed can becontrolled more specifically.

It is worth noting that, in the foregoing content and figures, only themethod 10 is used to illustrate the specific implementation modes of thepresent invention, and the specific implementation modes of a method 50are the same as those of the method 10, so the modes will not bedescribed again in the figures and specification.

On the other hand, as shown in FIG. 4, FIG. 7, FIG. 8 and FIG. 9, thepresent invention also provides the double-layer fabric 20 forpreventing water penetration, and the double-layer fabric 20 can bemanufactured by the method 10 or the method 50, respectively. First, thedouble-layer fabric 20 made by the method 10 will be described. Thedouble-layer fabric 20 includes the two surface layer textures 21 andthe cross-linked texture 24. Specifically, each of the two surface layertextures 21 includes a plurality of yarn loops 213, each of the yarnloops 213 is formed with the base yarn 211 and the fusible yarn 212, oneof the two surface layer textures 21 is heated and pressed, so that thefusible yarn 212 of the one being heated and pressed of the two surfacelayer textures 21 forms the barrier layer 25 capable of preventing waterpenetration. On the other hand, the cross-linked texture 24 cross-linksthe two surface layer textures 21, the cross-linked texture 24 is formedby the tuck knitting or the transfer knitting at a space between the twosurface layer textures 21, and therefore, the cross-linked texture 24 isprovided with the yarn-stacked thickness 241. When one side of thedouble-layer fabric 20 is heated and pressed, the yarn-stacked thickness241 causes an increased temperature of the one not being heated andpressed of the two surface layer textures 21 not higher than the meltingpoint of the fusible yarn 212, so that the double-layer fabric 20 formsthe barrier layer 25 only on one of the two surface layer textures 21,and the other of the two surface layer textures 21 is not melted byheat, thereby maintaining a feature of softness of the double-layerfabric 20.

Moreover, when the double-layer fabric 20 is knitted by the method 50,the double-layer fabric 20 also includes the two surface layer textures21 and the cross-linked texture 24. The two surface layer textures 21are respectively formed with the base yarn 211 and the fusible yarn 212,wherein a melting point of the base yarn 211 is higher than a meltingpoint of the fusible yarn 212, and the surface layer texture 21 formedwith the fusible yarn 212 (as indicated by reference number 215) isheated and pressed to cause the fusible yarn 212 form the barrier layer25 capable of preventing water penetration. On the other hand, thecross-linked texture 24 cross-links the two surface layer textures 21,and the cross-linked texture 24 is formed by the tuck knitting or thetransfer knitting at a space between the two surface layer textures 21,and therefore, the cross-linked texture 24 is provided with theyarn-stacked thickness 241. When the one formed with the fusible yarn212 of the two surface layer texture 21 (as indicated by referencenumber 215) is heated and pressed, the yarn-stacked thickness 241 causesan increased temperature of the one formed with the base yarn 211 of thetwo surface layer texture 21 (as indicated by reference number 214)after a heating and pressing time not higher than the melting point ofthe fusible yarn 212, so that the double-layer fabric 20 forms thebarrier layer 25 only on one of the two surface layer textures 21, andthe other of the two surface layer textures 21 is not melted by heat,thereby maintaining a feature of softness of the double-layer fabric 20.The double-layer fabric 20 of the present invention does not achievewaterproof effect by using the conventional mechanism, and is capable ofproviding a comfortable feeling for wearers.

In one embodiment, the cross-linked texture 24 can be formed with theyarn used for knitting the two surface layer textures 21 or formed withthe another yarn 240 additionally fed. Further, when the cross-linkedtexture 24 is knitted with the yarn used in the two surface layertextures 21, it means that the cross-linked texture 24 can be knittedwith the yarn formed by mixing the base yarn 211 with the fusible yarn212, the cross-linked texture 24 can also be knitted with the fusibleyarn 212 of the one formed with the fusible yarn 212 of the two surfacelayer textures 21 (as indicated by reference number 215), or knittedwith the base yarn 211 of the one formed with the base yarn 211 of thetwo surface layer texture 21 (as indicated by reference number 214). Inaddition, when the cross-linked texture 24 is formed with the anotheryarn 240 additionally fed, the another yarn 240 used in the cross-linkedtexture 24 can be formed with the base yarn 211, or the fusible yarn212, or be composed of the base yarn 211 and the fusible yarn 212.

What is claimed is:
 1. A method for manufacturing awater-penetration-preventing double-layer fabric, comprising steps of:step one: knitting two surface layer textures with current yarns,wherein the current yarns are selected from a group consisting of a baseyarn, a fusible yarn, and a combination thereof, a melting point of thebase yarn is higher than a melting point of the fusible yarn, and thetwo surface layer textures are selected from a first implementation typeand a second implementation type, wherein in the first implementationtype, each of the two surface layer textures comprises the base yarn andthe fusible yarn; and in the second implementation type, one of the twosurface layer textures is formed with the base yarn, and the other oneof the two surface layer textures is formed with the fusible yarn; steptwo: forming a cross-linked texture by continuously cross-linking thetwo surface layer textures through a tuck knitting or a transferknitting, and generating a yarn-stacked thickness during knitting at areserved space between the two surface layer textures to extend a heatconduction path of the cross-linked texture; step three: completing anintermediate product, wherein the intermediate product is a double-layerfabric; and step four: heating and pressing one side of the intermediateproduct to melt the fusible yarn in one of the two surface layertextures which is heated and pressed and to form a barrier layer whichprevents water penetration, wherein during heating and pressing thecross-linked texture, an increased temperature of one of the two surfacelayer textures that has not been heated and pressed is not higher thanthe melting point of the fusible yarn due to the yarn-stacked thicknessof the cross-linked texture.
 2. The method for manufacturing thewater-penetration-preventing double-layer fabric as claimed in claim 1,wherein in step two, the cross-linked texture is formed with the currentyarns used for knitting the two surface layer textures or formed with ananother yarn additionally fed.
 3. The method for manufacturing thewater-penetration-preventing double-layer fabric as claimed in claim 2,wherein the another yarn additionally fed is selected from a groupconsisting of a first yarn type, a second yarn type and a third yarntype, wherein in the first yarn type, the another yarn additionally fedis the base yarn; in the second yarn type, the another yarn additionallyfed is the fusible yarn; and in the third yarn type, the another yarnadditionally fed is composed of the base yarn and the fusible yarn. 4.The method for manufacturing the water-penetration-preventingdouble-layer fabric as claimed in claim 1, wherein a material of thefusible yarn is selected from polypropylene (PP) or thermoplasticpolyurethane (TPU).
 5. The method for manufacturing thewater-penetration-preventing double-layer fabric as claimed in claim 1,wherein a temperature for heating and pressing one side of theintermediate product is between 110° C. and 190° C.
 6. The method formanufacturing the water-penetration-preventing double-layer fabric asclaimed in claim 5, wherein in step four, applying negative pressure toone of the two surface layer textures that has not been heated andpressed.
 7. The method for manufacturing thewater-penetration-preventing double-layer fabric as claimed in claim 6,wherein in step four, locally heating and pressing one of the twosurface layer textures which is heated and pressed with high frequency.8. The method for manufacturing the water-penetration-preventingdouble-layer fabric as claimed in claim 1, wherein in step four, isapplying negative pressure to one of the two surface layer textures thathas not been heated and pressed.
 9. The method for manufacturing thewater-penetration-preventing double-layer fabric as claimed in claim 8,wherein in step four, locally heating and pressing one of the twosurface layer textures which is heated and pressed with high frequency.10. The method for manufacturing the water-penetration-preventingdouble-layer fabric as claimed in claim 1, wherein in step four, locallyheating and pressing one of the two surface layer textures which isheated and pressed with high frequency.
 11. Awater-penetration-preventing double-layer fabric, comprising: twosurface layer textures, knitted with yarns selected from a groupconsisting of a base yarn, a fusible yarn or a combination thereof, thetwo surface layer textures are selected from a first implementation typeand a second implementation type, wherein in the first implementationtype, each of the two surface layer textures comprising the base yarnand the fusible yarn; and in the second implementation type, one of thetwo surface layer textures being formed with the base yarn, and theother of the two surface layer textures being the fusible yarn; whereina melting point of the base yarn is higher than a melting point of thefusible yarn, one of the two surface layer textures is heated andpressed and the fusible yarn thereof is melted to form a barrier layerwhich prevents water penetration; and a cross-linked texture,cross-linking the two surface layer textures, the cross-linked textureis formed by a tuck knitting or a transfer knitting and comprising ayarn-stacked thickness located at a space between the two surface layertextures, wherein the yarn-stacked thickness at least meets a followingcondition that within a heating and pressing time, an increasedtemperature of one of the two surface layer textures that has not heatedand pressed is not higher than the melting point of the fusible yarn.12. The water-penetration-preventing double-layer fabric as claimed inclaim 11, wherein the cross-linked texture is formed with the yarns usedfor knitting the two surface layer textures or formed with an anotheryarn additionally fed.
 13. The water-penetration-preventing double-layerfabric as claimed in claim 12, wherein the another yarn additionally fedis selected from a group consisting a first yarn type, a second yarntype and a third yarn type, wherein in the first yarn type, the anotheryarn additionally fed is the base yarn; in the second yarn type, theanother yarn additionally fed is the fusible yarn; and in the third yarntype, the another yarn additionally fed is composed of the base yarn andthe fusible yarn.
 14. The water-penetration-preventing double-layerfabric as claimed in claim 11, wherein a material of the fusible yarn isselected from polypropylene (PP) or thermoplastic polyurethane (TPU).